/* * Non-Volatile Dual In-line Memory Module Virtualization Implementation * * Copyright(C) 2015 Intel Corporation. * * Author: * Xiao Guangrong * * Currently, it only supports PMEM Virtualization. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see */ #include "qemu/osdep.h" #include "qemu/pmem.h" #include "qapi/error.h" #include "qapi/visitor.h" #include "hw/mem/nvdimm.h" #include "hw/mem/memory-device.h" static void nvdimm_get_label_size(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { NVDIMMDevice *nvdimm = NVDIMM(obj); uint64_t value = nvdimm->label_size; visit_type_size(v, name, &value, errp); } static void nvdimm_set_label_size(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { NVDIMMDevice *nvdimm = NVDIMM(obj); Error *local_err = NULL; uint64_t value; if (nvdimm->nvdimm_mr) { error_setg(&local_err, "cannot change property value"); goto out; } visit_type_size(v, name, &value, &local_err); if (local_err) { goto out; } if (value < MIN_NAMESPACE_LABEL_SIZE) { error_setg(&local_err, "Property '%s.%s' (0x%" PRIx64 ") is required" " at least 0x%lx", object_get_typename(obj), name, value, MIN_NAMESPACE_LABEL_SIZE); goto out; } nvdimm->label_size = value; out: error_propagate(errp, local_err); } static void nvdimm_init(Object *obj) { object_property_add(obj, NVDIMM_LABEL_SIZE_PROP, "int", nvdimm_get_label_size, nvdimm_set_label_size, NULL, NULL, NULL); } static void nvdimm_finalize(Object *obj) { NVDIMMDevice *nvdimm = NVDIMM(obj); g_free(nvdimm->nvdimm_mr); } static void nvdimm_prepare_memory_region(NVDIMMDevice *nvdimm, Error **errp) { PCDIMMDevice *dimm = PC_DIMM(nvdimm); uint64_t align, pmem_size, size; MemoryRegion *mr; g_assert(!nvdimm->nvdimm_mr); if (!dimm->hostmem) { error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set"); return; } mr = host_memory_backend_get_memory(dimm->hostmem); align = memory_region_get_alignment(mr); size = memory_region_size(mr); pmem_size = size - nvdimm->label_size; nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size; pmem_size = QEMU_ALIGN_DOWN(pmem_size, align); if (size <= nvdimm->label_size || !pmem_size) { HostMemoryBackend *hostmem = dimm->hostmem; char *path = object_get_canonical_path_component(OBJECT(hostmem)); error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too " "small to contain nvdimm label (0x%" PRIx64 ") and " "aligned PMEM (0x%" PRIx64 ")", path, memory_region_size(mr), nvdimm->label_size, align); g_free(path); return; } nvdimm->nvdimm_mr = g_new(MemoryRegion, 1); memory_region_init_alias(nvdimm->nvdimm_mr, OBJECT(dimm), "nvdimm-memory", mr, 0, pmem_size); nvdimm->nvdimm_mr->align = align; } static MemoryRegion *nvdimm_md_get_memory_region(MemoryDeviceState *md, Error **errp) { NVDIMMDevice *nvdimm = NVDIMM(md); Error *local_err = NULL; if (!nvdimm->nvdimm_mr) { nvdimm_prepare_memory_region(nvdimm, &local_err); if (local_err) { error_propagate(errp, local_err); return NULL; } } return nvdimm->nvdimm_mr; } static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp) { NVDIMMDevice *nvdimm = NVDIMM(dimm); if (!nvdimm->nvdimm_mr) { nvdimm_prepare_memory_region(nvdimm, errp); } } /* * the caller should check the input parameters before calling * label read/write functions. */ static void nvdimm_validate_rw_label_data(NVDIMMDevice *nvdimm, uint64_t size, uint64_t offset) { assert((nvdimm->label_size >= size + offset) && (offset + size > offset)); } static void nvdimm_read_label_data(NVDIMMDevice *nvdimm, void *buf, uint64_t size, uint64_t offset) { nvdimm_validate_rw_label_data(nvdimm, size, offset); memcpy(buf, nvdimm->label_data + offset, size); } static void nvdimm_write_label_data(NVDIMMDevice *nvdimm, const void *buf, uint64_t size, uint64_t offset) { MemoryRegion *mr; PCDIMMDevice *dimm = PC_DIMM(nvdimm); bool is_pmem = object_property_get_bool(OBJECT(dimm->hostmem), "pmem", NULL); uint64_t backend_offset; nvdimm_validate_rw_label_data(nvdimm, size, offset); if (!is_pmem) { memcpy(nvdimm->label_data + offset, buf, size); } else { pmem_memcpy_persist(nvdimm->label_data + offset, buf, size); } mr = host_memory_backend_get_memory(dimm->hostmem); backend_offset = memory_region_size(mr) - nvdimm->label_size + offset; memory_region_set_dirty(mr, backend_offset, size); } static Property nvdimm_properties[] = { DEFINE_PROP_BOOL(NVDIMM_UNARMED_PROP, NVDIMMDevice, unarmed, false), DEFINE_PROP_END_OF_LIST(), }; static void nvdimm_class_init(ObjectClass *oc, void *data) { PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc); MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc); NVDIMMClass *nvc = NVDIMM_CLASS(oc); DeviceClass *dc = DEVICE_CLASS(oc); ddc->realize = nvdimm_realize; mdc->get_memory_region = nvdimm_md_get_memory_region; dc->props = nvdimm_properties; nvc->read_label_data = nvdimm_read_label_data; nvc->write_label_data = nvdimm_write_label_data; } static TypeInfo nvdimm_info = { .name = TYPE_NVDIMM, .parent = TYPE_PC_DIMM, .class_size = sizeof(NVDIMMClass), .class_init = nvdimm_class_init, .instance_size = sizeof(NVDIMMDevice), .instance_init = nvdimm_init, .instance_finalize = nvdimm_finalize, }; static void nvdimm_register_types(void) { type_register_static(&nvdimm_info); } type_init(nvdimm_register_types)